How To Find Absolute Humidity On Psychrometric Chart

Having taught psychrometrics to architects in the past we found that a major hurdle was trying to convincingly explain why the psychrometric chart uses absolute humidity in the vertical axis instead of the more familiar metric of relative humidity and why its characteristic curved layout is so important. These adiabatic lines have been plotted on the psychrometric charts for you.

Psychrometric Chart Absolute Humidity Gasparetto Engineering

how to find absolute humidity on psychrometric chart

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The total pressure and psychrometric chart design pressure is not same.

How to find absolute humidity on psychrometric chart. One of the major applications of the psychrometric chart is in air conditioning and we find that most humans feel comfortable when the temperature is between 220c and 270c and the relative humidity f between 40 and 60. Well now continue the example of the previous chapter with air at 200c with 60. As temperature and absolute humidity increase the enthalpy also increases.

The total pressure in the room is 089214 10 5 pa. The tool is for guidance only and does not constitute advice on humidifier size selection. On the vertical line corresponding to the temperature of 200c we go up until we reach the 60 hr curve.

This defines the comfort zone which is portrayed on the psychrometric chart as shown below. Moving to the right until the end of the diagram we find the absolute humidity vertical line. And you are said to find relative humidity of a room using given chart.

A psychrometric chart is drawn against two fundamental dimensions dry bulb temperature and humidity ratio. Absolute humidity ah ah kgm3 pw rw t where pw is water vapor pressure t is ambient temperature in kelvin rw is specific gas constant for water vapor and it is equal to 4615. Absolute humidity on the psychrometric chart.

This psychrometric calculator provides a suggested output for an industrial humidification system to achieve a desired room humidity based on certain internal and external conditions. We can use a psychrometric chart to determine the other properties of a moist air. For h 2 o the adiabatic saturation curve through a given state corresponds with constant wet bulb lines.

This is a coincidence only for the h 2 o air system. This formula is derived from ideal gas law and adapted for water vapor. Around the extremes of the chart and just outside of the saturation curve locate the diagonal scales which represent enthalpy in btu per pound of dry air.

Find the diagonal enthalpy scales surrounding the chart. Use a ruler to extend these measurements into the chart. You are provided a psychrometric chart which is designed for 101325 10 5 pa.

To find the outlet air humidity first find the inlet air point as the intersection of t db 4 o c and t dp. Explains how to read on a psychrometric chart. Dry bulb temperature relative humidity moisture content dew point temperature enthalpy humid air volume and wet bulb temperature.

Read Psychrometric Chart Dry Wet Bulb Temperatures Humidity Axes